Expansion bolt



^ H. F. v'oELKER.

' EXPANSIDN BOLT. Y APPLICATIQN FILED .FEB. vB, |922.

1,435,434, Pmtemv, 14,1922.

We@ l (Il Htl Patented Nov. 14, 1922.

Abpiieatibn filed February-a, 1,922. serial,itytaise.

Yorklymin the county' of New Castle 'andj State of Delaware, haveinvented certain new and useful Improvements injEXpan'sion Bolts,cation. i,

The invention relates to expansion' bolts, 'and has as anobject theprovision'of such'a device which may be placed in a perforation in astructure with readiness, and which may be expanded to effectively graspthe walls of the perforation. 4

A furtherobject of the invention is the provision of a casing which maybe placed about an eXp-ansion bolt to enable the same to be more readilyplaced.

An illustrative embodiment of the inven-y tion is shown in theaccompanying drawings, in which f Fig. v1 is a central longitudinalsection, partsbeing shown in elevation.

Fig. 2 is a perspective view, partly broken away, of the-casing.

Fig. 3 1s a plan view ofa blank from l which the casing may be produced,and

. the bottom 11 may be laid from the interior;

Fig. 1 is a perspective view on a reduced scale and partly broken awayof a portion of wall with `the casing expanded therein. A diinculty withthe application of expansion bolts heretofore has been that thedifferent parts fall out of their relation to. each other while beingplaced inthe-opening if the opening chances to have irregular Walls.

The present invention provides forv aremoval of this diiiiculty `by theprovision of l a casing 10, which is shown as comprising a sheet ofmaterial bent into cylindrical form. and provided with a bottom 11. Tohold the sheet of material in its position in cylindrical formone `edgeof the blank 12 from which it is produced is provided with tongues 13,and the opposite edge of the blank is provided with slots 14, into whichthe tongues may in Fig. 2.

VTo retainy the bottom 11 of the cylinder one edge of the blank 12 maybe crimped to form a flange, as'shown at 15, against which The expansiondevice is shown as comprising a plurality of members 16 which, whenassembled, produce a complete cylinder, and which are provided withprominent of which the yfollowing kis a speci-j be introduced, asclearly shown' are adapted to bite *intothe walls ofthe opening when thermeinberis'expanded.y @To f.

expand the device '16 the'` interiorthereof is threaded-'but isl formedupon the'- surface of `ridges17upon"tl'ieir eXter-iorjwhich ridges .f 'y

a' cone tapering toward its inner end. When well' .knowni manner." l

the). screw threaded bolt'18sscrewedjintof l I lthe expansionf'devicethefme'mber's ,16"'will" `forcibly spread, as shown in "Fig.f 4,` in a`To retain. ktheassembled expansiony mem-ff vbers in the casing' duringshipment ain'd'h'an-y dling the edge of thel casing iscrim'ped and ubent into a flange 19 int-hesame manner as the flange 15 alreadydescribed is formed; i The flange 19 yis formed after `theassembledmembers areintroduced 'into the casin and ensures thatthe'expanslonydevlcegwlll re-y` `mainin`1tspos1t1on` ready for use when1n shipping or storing operation. y The con truction of the casing 10issu that may' be*y readily ruptured by the expansion of the expansiondevice, allowing y the ridges 17 vto either piercey its vwalls or casingoutward into the walls `of the per-v. 1 y

foration in which the bolt is placed. `1

The casinglO'may be formed of any suit` f able material', a light gaugetin beingat present preferred. Whenthe portions' 16 of the expansiondevice are assembled within the casing 10 they aresecurely held in sucha position thatthey may be handled asv an entity and may ?be readilyintroduced into .l

the perforation-where it is desired tosecure the bolt 10, without losingtheir relation` to eac-h other.

The 'devicevis-capable1of` being used in: 95

many positions `which, have beenj impossible with devices of the lpriorart. `It is even possible .to wire them in place upon forms into n whichconcrete has to stillwet. To provide for entry` of thejgcrew withthethreads a portion 2O of the eXpansion device is made without threads andcyl-.` v1 f indrical of a size sufficient to permit of ready entryofthebolt 1 8.

'If necessary. the device ymay beV removed i after expansion within anopening since theU flexibility of thel shield will permit of its f isqueezing together andy pullingv out 'of the opening when the` vbolt 18has been "un-y screwed, so,v that nearly enough threads are so indentthem so as to carry the walls of the.. y

in engagement to give a hold upon the eX- pansion device to pull it withits shield out of the hole. l

The complete enclosure of the expansion device in the shield preventsany material,

such as sand or broken stone, gettingaccess.

to its interior, and thereby-interfering with the ready placing of thedevice. I

Minor changes may be made in the physical embodiment of the inventionWithout departing from its spirit. Y

WVliat l claim as new and desire to'secure vby Letters Patent is: v

-1. In lan expansion bolt, in combination, a plurality of readilyseparable members having yprotuberances Aupon their outer surfaces, Vavreaflgily rupturable and deformable easing adapted to hold said membersin assembled position, anchoring means adapted .to be :Eo-need bet-Weensaid members to spread the salme whereby to force said prot-uberans intoContact with the Walls of an opening in which it i5 desired to secu-resaid anchoring means with deformation of the Walls of thecasing.

2. An expansion bolt, comprising, in combination, a. plurality ofseparable members having a tapered threaded opening formed .therebetweenwhen in assembled position, a bolt adapted to be screwed into saidopening to spread the members, protuberances upon the outer surfaces ofsaid members, a casino* 'of material adapted to be deformed by saidprotuberanceg when said members are expanded and having the edges of theblank from Whichpit is formed vloosely .secured together enclosing saidmembers, a bottoni in said casing, a flange upon the mouth of saidcasing overlapping said members to prevent their removal therefrom.

HARRY r. voniinne

